[147592] in North American Network Operators' Group
Re: /128 IPv6 prefixs in the wild?
daemon@ATHENA.MIT.EDU (Owen DeLong)
Thu Dec 15 05:44:26 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <CAPLq3UPwo0j3QDiSJLqsoOOPzaN_xmGyyzLGfic_DEC2H6mSRg@mail.gmail.com>
Date: Thu, 15 Dec 2011 02:42:32 -0800
To: Glen Kent <glen.kent@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
You'll still probably carry the /128 loopbacks in your IGP to deal with =
your iBGP mesh.
Owen
On Dec 14, 2011, at 9:54 PM, Glen Kent wrote:
> Hi,
>=20
> In the service provider networks, would we usually see a large number
> of /128 prefixs in the v6 FIB tables?
>=20
> In an IP/MPLS world, core routers in the service provider network
> learn the /32 loopback IPv4 addresses so that they can establish
> BGP/Targetted LDP sessions with those. They then establish LSPs and
> VPN tunnels. Since we dont have RSVP for IPv6 and LDP for IPv6 (not
> yet RFC) we cannot form MPLS tunnels in a pure IPv6 only network.
> GIven this, would v6 routers have large number of /128 prefixes?
>=20
> What are the scenarios when IPv6 routers would learn a large number of
> /128 prefixes?
>=20
> I would presume that most IPv6 prefixes that the routers have to
> install are less than /64, since the latter 64 is the host part. Is
> this correct?
>=20
> Glen
